Yes. Any 2.5" (laptop) SATA drive can be used with a PS3.
Definately
When they work together, they create what is known as a computer. Hardware is just external drives, like flashdrives and external hard drives. Software is what is in the computer, like the motherboard. Together, they make a computer.
Since hard drives seldom affect a computer's speed, no. It will only give you more space for storage.
While external hard drives have the availability to work with multiple computers, it would be false to say every external hard drive works with every computer.
You need to do this to be able to find a high-performing one of the right size for you, and to make sure it will work on your computer.
If you do it properly, it should. I have two drives in the computer I'm using as I'm typing this.
I drive to work every morning. She drives a car. My computer has one drive. / My computer has two drives. My brother drives me crazy. His thirst for knowledge drives him to study harder.
Not all portable hard drives work with every laptop. Some portable hard drives are formated for specific types of laptops. For example a portable hard drive that is formated for a Mac cannot be used with a windows laptop
method of storing data on two or more hard drives that work together?
Your question is worded very oddly. Hard drives do not "work a computer"; if anything, it is the other way around. Please rephrase your question so that you make what it is you are trying to accomplish more clear.
Thumb drives are just like hard drives, any format will work on it.
Laptop hard drives are very similar to desktop hard drives, indeed they work in exactly the same way and even use the same interfaces. However laptop hard drives are designed to be much smaller (2 inches as opposed to 3.5) and draw less power than desktop hard drives. As a result laptop hard drives are usually much slower in terms of data transfer and have much smaller storage capacity than a desktop hard drive of the same year manufacture. With an adapter it is possible to use a laptop hard drive in a desktop computer, and if mounted externally it is also possible to use a desktop hard drive on a laptop.